Tech Tips – HVAC School For HVAC Techs, By HVAC Techs (Refrigeration as well)
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Modulation Motors
Modulation motors are not often seen in residential equipment but are used quite often in commercial and industrial applications on many different types of […]
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Tech Question – Why Do ECM Motors Trip a GFCI?
This question was submitted on the site in response to the recent GFCI tip. It’s a good question with several possible answers. What do you think? Hey […]
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Electric Heat & Blower Interlock
In residential air handler/fan coils it is common to use a high voltage interlock between the blower and the electric heat strips to ensure that the blower […]
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Combustion Air
In order to maintain combustion (burning) you need three things, fuel, heat and oxygen. If you have all three in the proper proportion you can maintain a […]
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Heat Pump Defrost Sensor vs. Thermostat
When you work on a heat pump system and you want to test defrost there are many different test procedures to follow to test the board and sensors. Most involve […]